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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9495c9922a432f9ea1f789d6ca96d236621749d2fcef3aaefe80b08dfc331a7b' 
  AND token = 'FiA3SEJnQZYh4ir0TkwE55taJhG4mv6CgX3O0/KU8Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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