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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fdd50550c92e1819d4f74f0b1eb3d24f3ae660509200f65ec917851cb94906' 
  AND token = '4vdfA5gXV9+tSf8oi8WvKSBj4+3o0O3k0+diYLUfavM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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