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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0330ccbf3f94e6e9a7d513effd335ff4522227cf0969f4cb6427b6d88e5e876' 
  AND token = 'u1sldgkdRRI4rEgCfajHv4pX0RnT4+3XSqlxaj8gZ8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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