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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0619382c03cd8069045c28fea18e20ab0b6327534154022a27961ce167dfa584' 
  AND token = 'cllcZhAqx9t9Qe6tf8TG8hZpkk3NwcLYuEwJNW/djU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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