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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961809b40bd11387af2e7f4f94d2d5351f194e2fba42ce1310f7dd12c8761f06' 
  AND token = 'QtldSCuKVF8pAEYyKUV4INMLwFEWTbnW4WHAk4BjfoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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