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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f4d4b99ca3475c7aa2c82a70306dc80b8c59fb7bd108a225cca53f002a2467' 
  AND token = 'Le4QiPnEKbELGuzc41JorAGaAfhXg0F0BgveIeMhHSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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