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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef91ad17533b8c3a3d543af6c795ac40de05d5e671f81d04c04d8c90ebea7a7' 
  AND token = 'b7bt4/q0hciXfM8lNpZ5oS3K5Nu1rnmcPM/lmQAEhEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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