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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070f06cb0f57ebd1dab215ed569a8edc9715cfd5b3468e849e59da7cb126e26b' 
  AND token = 'KEdvt5yWlanVuApACYf4nx+6r3msywx+uVkaWraD8Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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