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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969acd694301263480a864fe879b2c6a30384977b418c2bd285a763dd02c0ff9' 
  AND token = 'Z8QK2yM28T2T7DD0qJweZsEuxhUav0HRqM4AYLCQmtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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