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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405b2797852b63cd59db38fe7586d8f1822128276be96c429e9565ec7c601b43' 
  AND token = '3mLyW0ssey4DO35RFl1P9TtKQB+wT9w+uEH+hwHE0iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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