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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a9fa1c3ddf5ec360fe037026129f20c2c7d29ef9110ba2df140d01d62e2297' 
  AND token = '8iYbzedGqlTFtAWasNyoG1fo3Mynu8SwJKH6X1AvsqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}