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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6613c6e986f32cd21f6d3fd9c671599904a841b19912ea0249d7a79e22fcfd' 
  AND token = 'skft6JqfGpGuIlbxsTyl7n6oE7mMamP95LK5JW5jksQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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