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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8060090b7380be7b93670a2dfa1255f86ea91f3c315ee35478c718cbef65262' 
  AND token = 'bdAtv1YUlzmBCtBH9X07XDRcks3zXn0fgj8D1qaaPtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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