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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d1a7b05ebeaeeddcbdd3e95df7bf369fd54c98a7bf5d0cabb3dff67aca08d1' 
  AND token = 'GS1lDd4t6kctjnTo5YjmauirvX+QOgRZT+ekg2hv750=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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