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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0bbb01fda37cd0bbfb8e4faff472bbc3152190533e8696a36de5632538a84b8' 
  AND token = 'T/i98suEPjAuJMJlHyqtsZVC6q9KpFFqH35Hx2AH8V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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