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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87012b8d5478f2a487036a4f98f71b82aed9c1fdb3c4b33f550ccf1b425defb5' 
  AND token = 'c2kMSRjZ7t6uriXPy+O21PU2Xh7HpGpJseNnFl7Qe14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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