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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbc3b20564092c115bf02c6b78f74b6eb16e11adf722e202487f31cc4efcdc5' 
  AND token = '6K4d8L2HMBKEvjObTL1RllLBpbv+8gUTdAQLxw+EORY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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