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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9eada1331d036b70c15118573022e598361710f7e29196e37ffba3e92408e4' 
  AND token = 'sT9kq2UTuY5LRVmlB2dEvrCa4Q6+OpjraU/MI1u5g2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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