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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f6530a26ba5c9a09f8f1fe70eb9a51a858de47e4f78cf5848ba18df0b83ab5' 
  AND token = 'TCwaz2Kli9dZ/m7oEIXJMh6P59JA+ak/Imc1nKpRwQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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