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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c167d7321fafb81623ac1ed9fedd7c1c9c8b01b4d11f351b8668ea3642e45c' 
  AND token = 'v9QI2huqyzf/OWj/O015Su5CCFIA/4qMyyif1J7tkWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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