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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b48ee8d405b3c12adce4e88666b57e3345a07b1bc8f140f24416b798bafc9f' 
  AND token = 'IONLcoe4n0bjtyHDjqVn77Xx61dtCgbYDHuPLHXB6N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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