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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305044fc3244c1c2799ff6b7caa73ab6e322b7e787de933a19c7c738c44109a3' 
  AND token = 'W7VmTMzo8eI2R+IFHSRlwl/5CAYfK0TXLpFQYg4KCIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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