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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5efbea45bb918a78fc0a7582ac3c404a0542a98a0ae9dbf870db96e8b242b9' 
  AND token = '9ZARcv7HTjvh51eiweTDO6aYnQ5VuJihfP5dfROgy98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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