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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4fb0eeb82e7e18fce3e62ebbe9f81906320ddc2a70a7e53c30f03cacd30c51' 
  AND token = 'FgCPcWzzNXnFYH3s+cm7F43oQSqt5sjxhwKf2NhDijg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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