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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74b60ee298c1b4e47d08268b3b116b32af3220f3f1857161e92e351f59d7ff7' 
  AND token = '762ufk8nCHOyMn/LwEjN9fvOU89cSWLlRQG9sYI8AEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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