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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d82e75b17c188ad4faabcd60367681600b1476845a0d769f634808dcab66a1' 
  AND token = 'brZcmFr7nM0403dqQ9N2DOZsI6iKwx7z9mJJrbux/O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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