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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2eba9f2041a92927dac89ae5882a1699bb870a0d64bd40c5ca5df7096d69cf' 
  AND token = 'CGYOAeAtzM0n1GfPF0URGajTpqsWbUn+Ubf1jRIb9hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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