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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c8f050fbab9243a6cf3956498137c8cb2ac8968ed555a4551106821e442548' 
  AND token = 'pw4E/rozOhmgQ+PB/CyOrc9Bn1E2OnKmBsEVonuf9rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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