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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '374ebb4737f24226c2b93ff5144441dc30ecdabeb0739ddd122c0232e1287b65' 
  AND token = '7tre42OVoLEmJxBoMacoZsi3bmoCisN3YeO02d8sYM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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