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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b888fb7574819aafc70df9bc6cc6febf6431facb69651e5f6c20a273441cc55' 
  AND token = 'ix0waP3TRdiIL0/Bl3D4QquZDM9Qf8seC9EawMf3Fbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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