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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da6a96b9cd88c66358292fa6721424e2a65ec2fec830134a57a38a1d9ffc8a5' 
  AND token = 'kRMWo2i2KyUlN636uaQWPgEw/uYBs+qAFY4jcUVFjho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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