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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee13c95b710d137b8d3a3f9686875badd25f74d781422ad75a99f72ba7400c9' 
  AND token = 'hnXAvH2DxhngMbNouqwVvwfMmK0bqSTUboyyamzV9Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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