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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81db9719b0835ea7150858b8265633eac4c042cc198253fb0291f273e359d01f' 
  AND token = '4Kbhn9JighT9D2C37GO3/EuqBajpy77Pi82gg6Cvu/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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