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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d731652da8e5ad6cec3215e23efae463fe28e5124f6aaffe55493ab93db470' 
  AND token = '85ClBLDlLdxzRgznJfP52mehqXK7IZRB8yUO/t5emU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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