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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027515668a7d84bfb7beb8a60cce067029db6ecf7bad1f779272c98ac0ad34b2' 
  AND token = 'iZlb2z0N/iAo1bIltqWdq3mD7aByjzGziUMLlA29pSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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