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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56d263cbfafd5c4eccc0dba7d9ffc9d23514fdbfc0525d6177ad29780bf71bd' 
  AND token = '+pVYGaIV4DOGSCxqhyTYGpe/+yd0Sexw82h1tT0njJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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