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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1824e7864ca1f5d1e12f77ee35def5a3f43ca3a4ca33ce55e6d3b44507b7ea66' 
  AND token = '5eOlpNWf31g63+DW7OgMNgaXL413FMoBy8qn/TW5NWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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