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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6621de2de69cfd66c973f39e3c5960f76f8abb9b45b83b6fb8eeef21efe1cebb' 
  AND token = 'qxgWzx2lnit7xNrHI55i2UlYxnzeQQr+FYgK3EGkvhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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