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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e969d793c9b61ce8b4ac6a5d0d1aec399ca66415f23cfed34173ee599ec3cc16' 
  AND token = 'oBjUq+NIHtkPt2ztNwcXZSpvDGJSjcNE/t+CcDXToI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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