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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20655cf03b87ac12da14fbe8d56ce1aa6c59124586aad59ca6fa322ce1fdc2c4' 
  AND token = 'Y6E76CyM8RfnRyKk7DljbPA5GN4502paBwF57bWVumA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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