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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a477c69f447a7d5b697283f1c2529d0745ec38f9ec956d70f0d5a1dce6e26816' 
  AND token = '4FGuu1SeKmZ6HWLxomFHGANO+lx0/4LMhNfqayCi0LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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