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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682dc12628f5f0adaca2979941e1d1f0553e5b433dbf39830ad1dfc8a0505925' 
  AND token = 'L6Rj5dRpcv3IzXBU2HGzY9olFFTdo1mKztz20imLI6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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