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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0ed6ba5a27e9d6df4c41dab776ba833d91094dce442c7cc164f592f9eca67e' 
  AND token = 'UjSOH98KuvPegX3eC5saLa4iBgOfVUzU77CICYjVDBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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