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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2daa0a2ac2a6cfccd666e9681e2d4b95f49dcac1c1a4a6fc146e6dfee664344e' 
  AND token = 'BPdouizVGqh1Kjf3EZ3WEXHYVmwJmmUYIatls/JrdQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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