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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2e323a3a31910462fa288144eb8139359a9a0d407a94d94cbcb74fa82bb8fd' 
  AND token = 'fgvxqSEyo8bNfItr91bhDAOlQfFUiSgGRgPdYPrGOaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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