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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03accbf9b6143f5ab7a8a5e306e708388e337b0b4246498fbe7078be6776c494' 
  AND token = '9gNI1CknSMyGn/RLCSVKm7HjyDCsyK7oc3SxUBfDFcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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