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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b25e93f299a8b7b316deb5fe3fd3b7eccb241e406d600193c8320ed3f0f192' 
  AND token = 'nTJZ55oR+vqr+Wsz9oYduAvxifH+74JPshyiVP1ysE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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