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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600dc89ac4ff1d2b445131f5370d5a2e6ccb42a2555ba4b181384c3fdf38876a' 
  AND token = 'jne/0+GJ0fu1jXAfxrJNa/YycrSVmGAjBlQ11zGWRbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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