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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c7f41c38feb6b5411bca2975337aae4ae5efe82aabb479dda06e96368c9d83' 
  AND token = 'SYIwcz2O3A8OM18bdw9QeCfWladBBXSlSqk/PPhBis8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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