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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23c3ac781dd8c9d35698414629b13743aca4004621e7b2000b4e75b0404fc72' 
  AND token = 'VdeACE+7BiFFihCmAgzxJ0S79yIyPochSjxMdRPXfJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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