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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cbd524cdfe1d3deddbec6c8597726b9bb4c07ccdcfdc68221444c07a63b9ca7' 
  AND token = '/RSCvbiDRngSYRuOQsGZpuAJEK81jwhWE3Ta+3rei1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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