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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fdfad0c538f795b01eeb27205c6393a92978e26c7224b1dd0e10d3048ee642e' 
  AND token = 'vTHv1VwcKYWKP0MU1q8C6w7iFSUmPdEObADynB5/a08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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